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RE: Ornithoms, Parrots, and others
If you don't
>believe in tooth identifications you would have to explain why the tooth
>characters that can be used to diagnose K coelurosaur groups suddenly no
>longer diagnose these groups when you dip below the J-K boundary.
I, for one, will not accept archosaur taxon ID's beyond a course taxonomic
level, unless the teeth in question are from units where you also find them
attached to a skull. They're about the most plastic part of an archosaur,
evolve more rapidly than anything else, can vary within a population more
than just about any part, and can mislead very easily.
Department of Geology
Field Museum of Natural History
Roosevelt Road at Lake Shore Drive
Chicago, IL 60605